THE BIGWHEEL THREAD!!! Yamaha BW350, BW200

Discussion in 'Thumpers' started by Mr. BigWheel, Feb 4, 2011.

  1. Shercoman

    Shercoman Been here awhile

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    Having parts on hand is easier than taking my own bike apart!!
  2. Mr. BigWheel

    Mr. BigWheel b00b

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    Here are the 350s at Eska Falls from a ride last Saturday:

    [​IMG]

    Here's another with Cliff doing his best impersonation of Captain Morgan:

    [​IMG]

    Get some captain in you!

    Regards,

    Mr. BigWheel
  3. truckinwagen

    truckinwagen Adventurer

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    hey all, I just bought a BW200 of my own after riding my uncles all summer out in sunny Dutch Harbor.

    found an 85 for a song and just got it in running condition.
    had to replace the tires, rebuild and tune the carb, replace all the bearings and chain.
    other than that it just took a bath and some gas.

    it still needs the tank replaced, but the prices of new ones are too ridiculous to do that now( the one on it holds gas, but is all cracked and brittle.

    here are the pics of the bike after its shakedown run out at Jim Creek:

    [​IMG]

    [​IMG]

    [​IMG]

    [​IMG]

    the tires are ITP mud lite 25-8-12 on the front, and 25-12-9 rear and they are truly awesome!

    -Owen
  4. Cliff h

    Cliff h [IMG]http://i219.pho

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    Truckinwagon, Welcome!

    I looked at that bike that you bought from C.L. (the guy was in Spenard). The guy did not accept my offer, but I really didn't need another project so I passed on that one (I have 2 BW 350's). Glad you have taken on the project. Did you get the throttle smoothed out? It was like sandpaper when I looked at it. The tires certainly needed replacement as well.

    Now that you have done your shakedown ride at Jim creek, it is now time to completely take the bike apart and clean it. If you have not yet found out about eccentric bushings and primary chain adjustment, you soon will. At the very least, you should probably check the swingarm eccentrics and such twice a season (if you can, I am lucky to do it once a season). Mr. Bigwheel and I ride our 350's all winter long in places such as Jim creek and others with the aid of studded tires. Welcome!

    I just put new front and rear brake shoes on my bike this evening. The old ones would not stay adjusted at all. I have yet to take a test ride, but I can already tell that it will be a big improvement from my former non-existant brakes.

    Cliff.
  5. truckinwagen

    truckinwagen Adventurer

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    the bike has since been cleaned (about thirty seconds after the photo was taken) it just looked so good all covered in mud!

    I confess that I failed to see anything about the rear swingarm bushings that looked eccentric, but I could look into it more.

    all I did to the throttle was take it off, clean it real good, and put some lithium greese on the bar where it rides, works real good now.

    it really didn't take much to get rolling, the tires took more time than the rest of it combined.

    as for winter, I can see that, the bike my uncle bought had a chain on the rear and about 100 screw in carbide studs up front

    unfortunately the clearance between the rear tire and the swingarm might make even studs hard to fit.
    I am heading back out to Jim Creek tomorrow morning to get my bike all dirty again!

    -Owen
  6. Mr. BigWheel

    Mr. BigWheel b00b

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    truckinwagen,

    I second the welcome.

    The eccentrics that Cliff is talking about are just the bushings that the swing arm's shaft pass through. They look like this:

    [​IMG]

    They are machined with the hole off center and are rotated to provide adjustment for the tension on the primary chain.

    The bushings are a common source of trouble since they are extremely challenging to remove if they are neglected.

    This is what one side looks like when it is partially pushed out of the bore:

    [​IMG]

    Before too long, you'll have to adjust the primary chain and hopefully your eccentrics are still moving freely.

    I'm psyched that you grabbed that 200 and got it going again. We'll have to have a BW meet at Jim Creek and see how many Yamahas we can drown at one time.

    Regards,

    Mr. BigWheel
  7. truckinwagen

    truckinwagen Adventurer

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    cool, it does not look like the eccentric has alot of adjustment built into it, I just replaced the primary chain and it is good enough for now, as cheap as the chain is I can see just replacing it often to deal with tension issues.

    I am pretty pumped about the BW as well, super fun in the mud with the mud lite tires, the only place it feels underpowered is in the sand, but then again no matter what is between my legs I always want more power in sand. the light weight of the 200 is really nice, how much heavier is the 350?

    as for getting together, I will be out at jim creek tomorrow if anyone wants to join me they are very welcome.
    I am not terribly familiar with the Knik river public use area and got super lost a few times the other day.
    I am going to try to be out on the bike as much as possible to keep me from spending money on my other hobbies (cummins turbo diesels are much more expensive to play the power game with)

    anywhere local to get bigger footpegs? and any thoughts about moving them forward any? I have a hell of a time keeping my left heel out of the chain without putting the peg in the middle of my arch, while I would rather ride on the balls of my feet.

    anyway, just tweaked the idle jet for a little richer mixture off throttle, and it runs so much better now!

    hope to see some of you guys tomorrow at the knik river!

    -Owen
  8. Cliff h

    Cliff h [IMG]http://i219.pho

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    Truckinwagon

    I will probably not have the time to go to Jim creek tomorrow. I have some company coming in the early afternoon. I did have a ride planned tomorrow morning at Kincaid MX track to take one of my 350's for a shakedown ride and to take my girls ages 3 and 6 for a few laps around the track (if there are not any races going on tomorrow). If you can wait for jim creek till Sunday, I should be free, or join me for a few laps around the track tomorrow morning. PM your contact information if you are interested.

    As far as footpegs go, Yamaha TW 200 footpegs are much larger and more comfortable than the stock ones (at least on a 350). I purchased some el-cheapo TW 200 pegs from ebay that quickly fell apart (look at pictures earlier in the thread). I am looking to get a set of quality pegs from IMS, but they are about $80, which is hard to swallow, but seeing as the consequences could be dire if the cheap pegs break as a less than opportune time, it could be a cheaper investment to pay more for the quality ones. Go Pro on Dowling rd. carries IMS products, but I didn't see any of the ones for the TW 200 (read Bigwheel 350) when I was in there last weekend. I am not sure if the pegs are the same for a 200 vs. a 350, but we could compare the two if you like.

    Cliff.
  9. truckinwagen

    truckinwagen Adventurer

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    Yeah, I talked to Go Pro ( I bought my tires from them, super cool fellows) and they didn't have any foot pegs that would work, neither does yamaha.

    I am playing with the idea of welding a larger cage around the stock peg, that way I could add more to the front effectively moving the peg forward and away from the jackshaft.

    I would like to stop by tomorrow and say hi at the track, but Sunday looks pretty full, unless I spend tomorrow working.

    Hope to see you tomorrow.

    -Owen
  10. DEAVER

    DEAVER Been here awhile

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    Location:
    Spaniard's bay,Newfoundland. Canada
    So what exactly is the process of maintaining them (The eccentrics) as i hear u say some do at least twice a year.


    Intro:

    I'm Rod (super experienced ATV rider) from newfoundland, i just sold my 99' Suzuki Dr200 as it was way under my power needs and absolutly useless in our terrain which is very rocky. So i have arrangements to get a BW350 ($2500.00) in what looks like great condition, it's a 87. I have someone picking it up (dirtbike guy who knows his stuff) and bringing it 3000km to me. Should have it 1st week of sept. Never seen a 350 in person, just a 80 when i was much younger/ I've read all the pages in this sub-forum, some interesting comments and pics. You'll be seeing a lot of me in Sept. till then i'll keep reading. Cheers.
  11. truckinwagen

    truckinwagen Adventurer

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    good to see one more person who has all their priorities wrong :D

    after the ride yesterday it became clear that the motor in my bike needs some attention, it was dying randomly, like you turned the bike off all of a sudden, but still had spark and fuel.

    it wold take endless fruitless kicking only to fire up all of a sudden (with a huge cloud of smoke) and run great for a while, and then die again, maybe in ten minutes, maybe in ten feet..

    it smokes all the time, sometimes worse than others, and would occasionally(not all the time) loose power at full throttle.

    I think its a combination af a carb that needs attention and worn rings/valves that get bad at sealing as it gets hot.

    on top of that, it is just not powerful enough for the terrain around here.
    in dutch harbor with the rocky ground, surrounded by hilly tundra the 200 was fine, you could not possibly use all the power it made because you had to go slow, and the ground surface would not take much power before turning into quagmire, but in the sand and mud, the thing just gets you into trouble.

    so here I am looking at rebuilding a motor that is too gutless anyway.
    an engine swap comes to mind, a two stroke, to gain power and lose weight, that and I am familiar with them in a way that I just am not wth air cooled four strokes.

    the blaster 200 motor comes to mind, as does the ATC250R (I have a line on one of these)
    but then I remembered the tri-z...

    what happened to the tri-z(s) that gave uo their forks for the BW350(s)?

    any hope that there are some carcasses with thier motors still in them lying around?

    and of course any other insight would be welcome as well.

    -Owen
  12. Cliff h

    Cliff h [IMG]http://i219.pho

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    Truckinwagon

    It sounds to me like your CDI is dying. It is a fairly common failure point for our intrepid BW's. The symptoms are random dying out, much like what you are reporting. While I have not thrown a leg over a 200, I can imagine that the available power is somewhat less than adequate. I thought that I could smell burnt oil in the exhaust for what little time that I did hear that bike run, indicating that a rebuild may be in order. A two cycle engine transplant has been done, there is a picture or two earlier in this thread. As far as I know, all Tri-z's were water cooled making a radiator and somewhere to mount it part of the equasion adding to the difficulty factor.

    Cliff.
  13. Cliff h

    Cliff h [IMG]http://i219.pho

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    Deaver:

    Swingarm maintenance should really done after every (muddy dirty)ride, but that is not realistic.
    There is a video on youtube regarding swingarm maintenace. Here is the link:

    http://www.youtube.com/watch?v=jjJ2F9OA6ak&feature=my_liked_videos&list=LLERzr1St5bpilHR_yiluJFQ

    sixpepper is the master of all things bigwheel, and has a forum for bigwheels that is a valuable source of information. You have to sign up and create a username, but there is a wealth of resources available there.


    Cliff.
  14. DEAVER

    DEAVER Been here awhile

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    Location:
    Spaniard's bay,Newfoundland. Canada

    thank-u cliff, great info. i'll be doin this after the newness of the bike wears off. which forum are u referring too?
  15. truckinwagen

    truckinwagen Adventurer

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    would a dying CDI still make spark?
    and why would it nor run with spark? do these motors need a really strong spark to run?
    would the CDI cause issues with full throttle cut-out? or is that some other problem?
    (I am not particularly familiar with the ignition system on these bikes)

    and any recommendation as to where to get a new CDI/ways to protect the new one from failure?

    I could easily live with the power/smoke for a while if the damn thing would run consistantly.

    the 250r motor is water cooled as well, which is why the Blaster motor is tempting.

    -Owen
  16. Cliff h

    Cliff h [IMG]http://i219.pho

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    Deaver:
    Sorry I forgot to mention that the other forum is a Yahoo forum.

    Truckinwagon:
    I have not had a bad CDI myself yet, but just the symptoms that you describe seem to be a common thread from other BW owners and intermittent dying. It may be weak spark??? Intermittent problems are hard to diagnose, and a replacement CDI is not a very in-expensive part to replace on a guess. Ebay is a good source for parts (such as CDI) partshart is another good source, there are others, but these are the two that come to mind at the moment. I posted a question on the Yahoo forum asking if using resistor spark plugs have a detrimental effect on CDI's. Some say it may effect it, some say it does not. So I don't really have a definitive answer on why many CDI's are dying an early death, it could be just a poor design. There is a guy in New Zealand that is taking old CDI's apart and rebuilding them. Again, this information is on the Yahoo forum. As for the 250r motor, I believe that the '82-'84 motors were air cooled, but it sounds like you have access to a liquid cooled motor.

    Cliff.
  17. truckinwagen

    truckinwagen Adventurer

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    yeah, the 250r in mind is a liquid cooled one.
    its a good running wheeler missing the rear end(swingarm, axle wheels etc...) so it is tempting not just for the motor, but also the forks.

    I will see if I can find a CDI, maybe one from an xt200 would work since the motors are the same.

    and I will probably go for a blaster motor if I do a swap, easy to find, light, huge aftermarket etc...

    -Owen
  18. truckinwagen

    truckinwagen Adventurer

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    well looks like the cdi's on ebay are going for $300+ so I will see what else it could be first.

    might even try to make a generic one work, not like there is much to them.

    if it is the CDI, and only the factory one will work, all the more reason to swap in some other motor!

    looks like the CDI for the blaster is only $30, or if you want a performance advance/high redline one $50.

    -Owen
  19. Mr. BigWheel

    Mr. BigWheel b00b

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    I wouldn't worry too much about the power in the 200. Keep it running until you can find a 350. They are out there, you just have to beat Cliff to them.

    Jim Creek is the most open , power-sucking riding area that we have. The 200 is going to seem inadequate there no matter what. Anywhere else in the Valley you will run out of suspension before you run out of power.

    Right now you are the savior of a neglected machine and that can be incredibly frustrating. The problem can be compounded by a model that has a scarcity of parts.

    However, changing the engine on a 200 is generally a money losing proposition. In a large way. Their resale is too low to justify the time and effort.

    Unfortunately, the CDI is a very common failure on the 200 and 350 as well. The XT200 CDI does work with certain models of the 200.

    Are you electric start or kick only?

    Regards,

    Mr. BigWheel
  20. truckinwagen

    truckinwagen Adventurer

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    I have the kick only model, I am hoping I can get a cdi for less than an arm and a leg. And like I said before, I could live with the power if the darn thing would keep running.

    I'll keep looking though, and if I were to shoehorn something else in it the plan was to make new mounts that bolt in without changing the frame, that way it could be put back to stock if I needed to.